# frozen_string_literal: true

module Bundler
  # Handles the installation of plugin in appropriate directories.
  #
  # This class is supposed to be wrapper over the existing gem installation infra
  # but currently it itself handles everything as the Source's subclasses (e.g. Source::RubyGems)
  # are heavily dependent on the Gemfile.
  module Plugin
    class Installer
      autoload :Rubygems, "bundler/plugin/installer/rubygems"
      autoload :Git,      "bundler/plugin/installer/git"

      def install(names, options)
        version = options[:version] || [">= 0"]

        if options[:git]
          install_git(names, version, options)
        else
          sources = options[:source] || Bundler.rubygems.sources
          install_rubygems(names, version, sources)
        end
      end

      # Installs the plugin from Definition object created by limited parsing of
      # Gemfile searching for plugins to be installed
      #
      # @param [Definition] definiton object
      # @return [Hash] map of plugin names to thier paths
      def install_definition(definition)
        plugins = definition.dependencies.map(&:name)

        def definition.lock(*); end
        definition.resolve_remotely!
        specs = definition.specs

        paths = install_from_specs specs

        Hash[paths.select {|name, _| plugins.include? name }]
      end

    private

      def install_git(names, version, options)
        uri = options.delete(:git)
        options["uri"] = uri

        source_list = SourceList.new
        source_list.add_git_source(options)

        # To support both sources
        if options[:source]
          source_list.add_rubygems_source("remotes" => options[:source])
        end

        deps = names.map {|name| Dependency.new name, version }

        definition = Definition.new(nil, deps, source_list, true)
        install_definition(definition)
      end

      # Installs the plugin from rubygems source and returns the path where the
      # plugin was installed
      #
      # @param [String] name of the plugin gem to search in the source
      # @param [Array] version of the gem to install
      # @param [String, Array<String>] source(s) to resolve the gem
      #
      # @return [String] the path where the plugin was installed
      def install_rubygems(names, version, sources)
        deps = names.map {|name| Dependency.new name, version }

        source_list = SourceList.new
        source_list.add_rubygems_source("remotes" => sources)

        definition = Definition.new(nil, deps, source_list, true)
        install_definition(definition)
      end

      # Installs the plugins and deps from the provided specs and returns map of
      # gems to their paths
      #
      # @param specs to install
      #
      # @return [Hash] map of names to path where the plugin was installed
      def install_from_specs(specs)
        paths = {}

        specs.each do |spec|
          spec.source.install spec

          paths[spec.name] = spec.full_gem_path
        end

        paths
      end
    end
  end
end
